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A287492 as a simple table

na(n)
01
13
21
314
41
563
60
7255
81
91023
101
114094
121
1316383
149
1565526
169
17262135
189
191048566
2025
214194287
2225
2316777190
2425
2567108839
2631
27268435424
28127
291073741744
3079
314294967223
3275
3317179869175
34120
3568719476623
36496
37274877906511
38432
391099511627343
40944

[1,3,1,14,1,63,0,255,1,1023,1,4094,1,16383,9,
 65526,9,262135,9,1048566,25,4194287,25,16777190,
 25,67108839,31,268435424,127,1073741744,79,
 4294967223,75,17179869175,120,68719476623,496,
 274877906511,432,1099511627343,944]